Low temperature polyurethane 92 AU the material for use at temperatures down to 50 C. Materials Information Low Temperature Polyurethane

Size: px

Start display at page:

Download "Low temperature polyurethane 92 AU the material for use at temperatures down to 50 C. Materials Information Low Temperature Polyurethane"

Randall Hutchinson
6 years ago
Views:

Low temperature polyurethane 92 AU 21100 the material for use at

1 Low temperature polyurethane 92 AU the material for use at temperatures down to 50 C Materials Information Low Temperature Polyurethane

2 Simrit, Your Global Technology Specialist for Seals and Vibration Control Simrit, Your Global Technology Specialist for Seals and Vibration Control offers you a complete service package. A unique range of products and services guarantees you numerous advantages over the competition. Simrit acts as a partner to general industry. Its position as a market leader is achieved through continuous research, development and manufacture. We have the world s widest range of seals and vibration control products, and can offer you solutions based on the demands of state-of-the-art-technology, solutions which set standards. This way we secure competitive advantages for you based on experience all around the world: Simrit has a presence throughout Europe, America and Asia, either directly or through its affiliated companies NOK (Japan) or Freudenberg-NOK (USA). The transfer of knowledge between these markets is incorporated directly into the Simrit service package. With our many Simrit Service Centres and Simrit distribution Partners, we serve and supply more than 100,000 customers worldwide. Our Simrit Partners ensure rapid availability from stock. This means spare parts quickly arrive when and where they are needed. There is a Simrit Partner near you as well. Make the most of Simrit s service package and give yourself a real competitive edge: Constant innovations Uniquely wide range of products Strong product brands Unique materials expertise A wide range of value added services Simrit offers a complete package of products and services, including leading brands such as Simmerring, Merkel, Integral Accumulator, Lederer and ISC O-Ring. Vibration Control Special Sealing Products: Bellows, Diaphragms, Elastomer Composite Parts and Precision Mouldings Lederer Liquid Silicone Products ISC O-Ring Integral Accumulator Merkel Hydraulics / Pneumatics Simmerring 2

Polyurethane materials from Simrit Extraordinary operating conditions create extraordinary demands on function-critical machine components: higher power density, longer operating times and changing

Increasingly stringent environmental protection regulations also give cause for a more critical assessment of leakage behaviour.

3 Polyurethane materials from Simrit Extraordinary operating conditions create extraordinary demands on function-critical machine components: higher power density, longer operating times and changing operating conditions in various climatic zones (e. g. polar regions) require seals with special geometry and materials so that they can reliably perform their tasks even at extreme situations. Increasingly stringent environmental protection regulations also give cause for a more critical assessment of leakage behaviour. The demands on modern seals in hydraulics are therefore high: Elastic in the cold but still providing sufficient extrusion resistance at higher temperatures and pressures Resistance to various media and additives Constant functional reliability over the entire service life With its varied range of polyurethane (PU) hydraulic seals that have been tested and proven millions of times, Simrit offers successful solutions for all areas of use the result of many years of experience in material development and processing. Particularly in mobile hydraulic applications, Simrit's PU seals are notable for their high functional stability and reliability. 3

New low temperature material 92 AU 21100 With the new low temperature material 92 AU 21100, Simrit has succeeded in developing a polyurethane material that is specially designed to meet the specific

4 New low temperature material 92 AU With the new low temperature material 92 AU 21100, Simrit has succeeded in developing a polyurethane material that is specially designed to meet the specific requirements for use at low temperatures and yet can also handle standard applications with no problems: the operating range of 92 AU stretches from 50 to +100 C. Soft segment Flexibility Low temperature performance Chemical resistance Polyol Modules Hard segment Hardness High temperature performance Processability Diiscocyanates Chain extenders Fig. 1: Polyurethane materials modules This is made possible by targeted modification of the PU components responsible for temperature properties, while leaving the remaining material properties comparable to Simrit s standard PU materials. The 92 AU PU material demonstrates particularly beneficial viscoelastic behaviour, whereby the soft segments retain their flexibility over a broad range of temperatures and only solidify at very low temperatures. There is no negative influence on other critical material properties such as hardness and tensile strength, which are comparable with those of proven Simrit traditional polyurethane materials. In practical terms, this means that seals made of the 92 AU material are sufficiently flexible even at extremely low temperatures and have the necessary sealing effect immediately after commissioning. This allows initial leakages to be reliably prevented. 4

Viscoelastic behaviour of seals made from 92 AU 21100 The low temperature 92 AU 21100 material offers outstanding performance (see Table 1).

Comparison between physical and chemical properties 92 AU 21100 Standard Hardness DIN 53505 Shore A 92 94 Tensile strength DIN 53504 MPa 63 64 Breaking elongation DIN 53504 % 770 470 Rebound

5 Viscoelastic behaviour of seals made from 92 AU The low temperature 92 AU material offers outstanding performance (see Table 1). The Tü (DSC) is 55 C and the TR 10 is 57 C (see Table Comparison between key materials parameters on page 7). Comparison between physical and chemical properties 92 AU Standard Hardness DIN Shore A Tensile strength DIN MPa Breaking elongation DIN % Rebound resilience DIN % In order to describe the practical functional behaviour of the material, tests have also been carried out in conjunction with the seal designs used. These fully confirm the outstanding low temperature flexibility of the 92 AU Table 1 Material A Standard material Material B 92 AU Geometry U-cup seal Dimension Rod deflection +/ 0.15mm in 0.2sec. Special Testing at Simrit Laboratories involved targeted deflection of the piston rod to identify how quickly the seal can follow the deflection the lower the temperature, the greater the difficulties with traditional polyurethane and the clearer the advantages of 92 AU (see Figure 2).. Fig. 2: Examination of low temperature flexibility on seal 5

6 The test results in Figure 3 show the detailed response times of the seals tested with eccentric rod deflection and at different temperatures. Compared to traditional polyurethanes, the 92 AU material has a much shorter response time and thus ensures outstanding low temperature flexibility of the seal. The sealing lips remain in constant contact with the contact area. Contact time (s) Temperature ( C) Standard 92 AU Here it can also be seen that the low temperature material 92 AU can stand up to a comparison with conventional polyurethanes in terms of mechanical performance (see Fig. 4). Fig. 3: Contact time for contact of rod with various materials Relative module G'/G'(0 C) Module standardised to 100% at 0 C With the new low temperature 92 AU polyurethane, a material is now available for diverse applications that will reliably seal hydraulic systems even at extreme temperatures of around 50 C. Temperature ( C) Figure 4 Recommended series in combination with new polyurethane material 92 AU Rod seals Piston seals Wipers NI 300 SIMKO 300 AUAS T 20 (OMK-PU) AUAS R LF 300 T 19 PU 5 PU 11 PRW1 6

Comparison between key materials parameters Temperature ( C) 10% predeformation 25% predeformation 10% predeformation 2 h after relieving of load measured at low temperatures

7 Comparison between key materials parameters Temperature ( C) 10% predeformation 25% predeformation 10% predeformation 2 h after relieving of load measured at low temperatures High-performance polyurethane material with unique low temperature flexibility for temperatures down to 50 C. Necessary sealing effect achieved immediately after commissioning. 7

Materials Information Low Temperature Polyurethane Simrit, Your Global Technology Specialist for Seals and Vibration Control Simrit Services Your Benefits Constant innovations Technological edge

8 Materials Information Low Temperature Polyurethane Simrit, Your Global Technology Specialist for Seals and Vibration Control Simrit Services Your Benefits Constant innovations Technological edge Uniquely wide range of products All from one source Strong product brands Specialised technological expertise Unique materials expertise Longer unit service life A wide range of value added services Competitive advantages, efficiency and lower costs e.g. Low temperature polyurethane 92 AU Your Benefits Use at temperatures down to 50 C possible Tested compatibility with low temperature media Excellent slide properties Vibration Control Special Sealing Products: Bellows, Diaphragms, Elastomer Composite Parts and Precision Mouldings Lederer Liquid Silicone Products ISC O-Ring Integral Accumulator Merkel Hydraulics / Pneumatics Simmerring Headquarters Europe: Freudenberg Simrit KG D Weinheim, Germany Phone +49 (0) Simrit Phone +49 (0) Fax +49 (0) info@simrit.de 20 GB Br. ABT

Finite Element Method (FEM)

Finite Element Method (FEM) Technical Principles Description of the Operation of Simrit Seals using the Finite Element Method (FEM) 974 Examples 50 Simmerring 977 Hydraulic Seal 977 Pneumatic Seal 978